func main() {
var nBytes uint64
var s uint32
in := os.Stdin
for {
buffer := make([]byte, 10000)
count, err := in.Read(buffer)
if err == io.EOF {
break
}
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
nBytes += uint64(count)
s = sumBuffer(s, buffer[:count])
}
// fmt.Println("raw", s)
if nBytes == 0 {
s = cksum.Accumulate(s, 0)
}
for a := nBytes; a != 0; {
var x byte = byte(a & 0xff)
s = cksum.Accumulate(s, x)
a >>= 8
}
// for i := 0; i < 4; i += 1 {
// s = sum(P, s, 0)
// }
fmt.Println(^s, nBytes)
}
func sumBuffer(s uint32, buffer []byte) uint32 {
for i := 0; i < len(buffer); i += 1 {
s = cksum.Accumulate(s, buffer[i])
}
return s
}